Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
- Gold
- Copper
- Silver
- Silver Equivalent
|
| Mining Method |
|
| Production Start | ...  |
Source:
p. 86
Contractors
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Deposit Type
- Sandstone hosted
- Porphyry
- Epithermal
Summary:
Two types of mineralized deposits are recognized at the La Arena property – high-sulfidation epithermal gold deposits and porphyry-hosted copper-gold deposits. The epithermal gold deposits are hosted in sediments of the Lower Cretaceous Chimu Formation and the copper-gold deposit is hosed in Oligocene-age multi-stage intermediate intrusions.
Both deposits are characterized by alteration and mineralization occurrences as defined and described by Hedenquist (1987), Hedenquist and Lowenstern (1994), Arribas (1995) and Sillitoe (2010), among others. The epithermal gold deposit currently being mined is characterized by supergene oxidized high-sulfidation mineralization, which occurs in fractured sandstones and hydrothermal breccia zones. The porphyry deposit is dominated by primary copper sulfides with gold and lesser molybdenum.
High sulfidation epithermal gold deposits form in geothermal systems where hot acidic hydrothermal fluids emanate directly from an intrusive source and generally remain undiluted by ground water. As is the case at La Arena, these deposits often represent the upper parts of porphyry systems where the two types of mineralization often overlap. High-sulfidation deposits can display a wide variety of mineralization styles, including veins, hydrothermal breccias, stockwork, and disseminations or replacements.
In porphyry deposits, the sulfide ore minerals are dominantly structurally-controlled, with most mineralization occurr ........
Summary:
The current operation has been mining the oxide deposit at the La Arena Mine since 2011. The operation is a conventional drill, blast, shovel and truck open pit run-of-mine (ROM) operation. Mining is carried out on two 12-hour shifts, operating 7 days a week under an alliance style contract with Peruvian contractors. The oxide ore is hauled directly from the pit to the leach facility or to stockpiles.
The La Arena Mine Calaorco open pit is mined by conventional truck and shovel methods. The mining fleet consists of 90 tonne class rock trucks and 10 m3 hydraulic shovels. Blasthole drilling is performed by diesel powered rotary single pass track drills.
The bench height is 8 meters. Double benching is applied with a catch bench 11 meters wide in sandstone and 12 meters wide in porphyry. Inter-ramp wall angles are 43.5° in sandstone and 37.0° in porphyry.
Ramps are constructed 25 meters wide including berms and ditches. Leach ore is direct hauled to the leach facility or to ore stockpiles.
All waste material is hauled to the waste rock storage facility located south of the Calaorco pit. Non-Acid-Generating (NAG) waste is used to encapsulate the Potentially Acid Generating (PAG) waste.
Flow Sheet:
Summary:
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Reserves at June 30, 2021:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
24.8 Mt
|
Gold
|
0.39 g/t
|
314.1 koz
|
|
Probable
|
21.9 Mt
|
Gold
|
0.27 g/t
|
193.3 koz
|
|
Measured
|
1.6 Mt
|
Gold
|
0.32 g/t
|
16.2 koz
|
|
Indicated
|
2.6 Mt
|
Gold
|
0.22 g/t
|
18.1 koz
|
|
Inferred
|
8.9 Mt
|
Gold
|
0.24 g/t
|
70.1 koz
|
Corporate Filings & Presentations:
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